Valve gear



J. PERRY Jan. 24, 1928.

VALVE GEAR Filed July 18, 1921 3 Sheets-Sheet 1 www L m. I I .n l U\\\|\|fl\ a II II I 1 II m I n: IIIIn.. l e Izxo W I ,III a o I, I|i IIII| I 4 f 0 I, I I I I d./ U, a I o .f Q 0 0 ,f f o I I m/IIFIII I IIIIIIIIIIIIII 9 I TIG IoI JIIIIIII I I I I IfIIIIIIIIIIIIIIIIII I WWII l.. I II w I I I Jan.24,1928.

S.J.PERRY VALVE G EAR Filed July 18. 1921 3 Sheets-Sheet 2 Jan. 24; 192s.

S. J. PERRY VALVE GEAR FiledlJuly 18, 1921 5 Sheets-Sheet 5' Uli boa

@Mouw/La# S/a/frey J Hor/y Patented Jan. 24, 1928.

l UNITEDSTATES PATENT OFFICE.

VALVE GEAR.

Application and July 1s My `present invention relates to improve` ments in valve gears for steam locomotives, ofthat type involving a reversible and variable cut off mechanism for the steam valves, whereby the valve gears and the motion of the gears are actuated and controlled by a combination shaft lever and bell crank, together with rock arms and connections from a cross head. i

The primary object of the invention is the provision of valve gearingmechanism by means of which a quicky and complete action of the valve is secured at the point of admission to the cylinders 4and at the cut l oii'l of steam to the cylinders. The invention also involves a well balanced mechanism which may be manipulated with facility, by hand for adjustment of the valves and for yreverse movement, and by the reduction of parts to a practical minimum, economy in lubrication is insured. The utilization of a minimum of parts also correspondingly reduces the weight of the mechanism, and by the association of parts according to my invention a substantial and durable mecha-` nism is provided to withstand wear while the locomotive is in service. With the above ends in view the'invention consists in certain novel combinations `and arrangements of parts as will be hereinafter 4 more fully described and claimed.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention wherein the parts are combined 1 and ar` ranged according to the best mode I havel thus far devised for the practical applica-` tion of the principles of my invention.

Figure 1 is a side view of a portion of a steam locomotive showing driving wheels, cylinder and steam chest in section, and `my improved valve gear applied thereto and l driven from the cross head of the piston, the full lines `showing the position of gearing on the center and in dotted lines full gear ahead with the piston at mid stroke. y

Figure 2 is a perspective view showing the two sides ofthe locomotive with the engines and valve gears and the cylinders in section. Figure 3 is a detailview in perspective of part of the reversing mechanism.

Figure et is a detail view showing the pair et combined rock shafts and bell crank 1921. Serial No. 485,516.

levers forming part of the gear mechanism. Figure 5 is a view in side elevation of the mechanism at a position 180 ffrom that shown in Figure n y .FigurefG is a view transversely of the engine showing the supporting frame in sec` tion, .illustrating the telescoping rocker` shafts andtumbler shafts, partly in section, andthe valve gear at both sides of thelocomotlve.

In the preferred form of the invention as illustrated-'in the drawings I have designated the steam cylinders at the sides of the locomotive as 1 and 1 "with their usual formof pistons 2, 2 and rods 3, 3" having the cross heads 4,4 and guide bars 5, 5 therefor.` A pair of the engine driving wheels is indicated at 6, 6 anda connecting rod 7 is pivoted as usual to the cross head, while the customary formof slide valves 8, 8 are reciprocated through the instrumentality of the valve stems 9 and 9 and slide blocks 10 and 10a on guides G and Gr.v c

As indicated in the drawings the valve gear or operating mechanism at each side of the locomotive is located between `the cross head which actuates the mechanism,

andthefvalve cross head 10 of the valve.

stem, the valve cross head receiving motionl from the valve gearing. The complemen' tary parts of the valve `gears at the sides of the locomotive are substantial duplicates, the movement of parts of the engine at the left side of the locomotive being shown in Figure 2 as ninety degrees in advance of the engine at the right or Vnear side of theA locomotive. In this figure the piston of cylinder 1 is at the extremeof its forward stroke and `about to `return and exhaust the steam from the cylinder, whilethe piston of cylinderla is midway of its return stroke,

aheadof the piston of cylinder 1.

In the drawings the two sectional, coaxial shafts 11 and 12 are supported in suitable bearings in the engine frame, as is also therock shaft 13, and while the tumbler shaft sections 11 and 12 are relatively movable and the rock shaft 13 isoscillatable, their bearings are stationary. y 4

The valve gearing is thus supported in the engine frame on the two shafts 11`12 and 13, andcontrolled from the engine cab, by hand, by manipulation of the reverse lever 'l-l and the two rezieh rods 'l5 and 151, the lever being' `pivoted on trnnnions or pin 1G in euitnlile hearings.

The tivo shalt sections 1l und 12eme eeni neeted to the reach rods; hy their lever urine 1T und lT und these eoztxieil shatter, which nre preferably ot teleL ,Opie eonstrnetioin:ire turned in reverse directions or oppositie direetione hy the torn'nrd or reverse movement oit the lever ll', no readilyY seen in Figure 2.

At the outer extremities et the shafts li :ind l2, and beyond their hearings, ere a pair et fixed :Velten 1S sind 18', whiehne seen in Figure 3T nre each integral with its respective eeetion of the dividedroelt Shaft 'llnl` und these yolee with their open ende townrd the eyl'indere et the engines may be turned in the elin'lt hearings with the eonxinl ehet sections ne Centern. 'Vithin thevokes are pivoted o pair of swinging suspension arnis llnnd lil having their lrnnnene 20, 20 freely pivoted and sugported in the ends et` the }:el-;ee, and ofn length to extend haelt Within the voltes in nlinejinent with the fixes of the divided shaft sections llmll. Thun with 4the suspension nrnis Carried `h if the voliee it n'ill he apparent that, when the )folien are adjusted upon the :irzinleenters et the: @hatt lienringe the pivoted ende or trnnnionel ot the si ension nrins will lie Envung through :irre oi n eirele with the ghetti een ters ne the Center el movement, l3nt-the Suepension ernis ere allee :l'ree to ifnvilig,V on their trnnnions es part et the valve geur when in operation.

From these nnjusteble enepension nfrine of the tivo engines :1ro supported: the tranne Structures ot the vulve gearing, in'eonnection with the roelt shalt-13 end valve rode` 2l :ind Q1 thnt are pivoted to the vulve cross heads it), l0 et the vnlve Steins 95 9 und the vulve earine; is actuated troni the erosfs heet-lent the pistons through theinetrinnen` tailityr oit rods'ZQTQQ :is the eroee heads reeiproente under steznn pressure in the o vlinders,

The roeltv shaft 13, which is hollow and elignriorted to roel: in bearings in the engine traine, eneueee nu inner Sli-.itt 13, :ind as liest: :geen in Figure it these eti-axial shaft seetionn each line :it one extreniituF n, lever es 23 end 23', the 4ornier keyed on the end of the inner shaft Section ll and the letter termed in teg'rail with the end ot the hollow shzirlft seetion 13, find nt Q4, Q41 the ,lower ende of these levers` :ire pvoted to their rods 22 and' 22" und thus netnntedfroln the Cross hoede il, et. As the cross heads reciprocate, it will be ep? parent that the levers 23 and 23"- ere caused to oscillante and this rocking movement ie supported hy the hearings for the concentrie slmt'it Sections 13 13 in the engine trarne.

lAt their upper ends. the short arms 25 ot thefl'e levers :1re pivoted :is et 26,26 to the eoinplenientmy` combination levers 27 27 :ind the reni' ende` ot the vulve riode` .21 :1nd .31 nre pivoted et Qd to these eoinliiinntion level-e. and :is time eonneeted the reciprorntingj motion et the cross hond traineniilted to the vulve rode tol'llie pui-pone nl revint-eenling; the vulves ot: the engines.

Thinv recinroesition et the velt-'en1 muy lie ulter-ed :ind :uljuetml liv varying the |`ionition nl the eueiieneion voltea sind :lt the uriner ende ot the roinliiinilion invern. :diove the vulve rod connections rire linie#f El) lfl n'liieh pivotzlllv erinnert the nllort nrnls fill lll l the r'oinliiniilion invern with the :j Fiispennion ernia: lil lll. lt will i ltlnzl; the length olf thee-e ll'nlte 2l le vfilh the length ol the on eine? und with the drt inve lietween the pivot pointe ol theee :irme and the axial eerdere et the divided shaft ln edditionte the lixed :rewriting levers en tie roel; @hotte l :ind lil heee shafts here levernrniifi el sind lll rigid with the respeetre Sheltie irhieln together with the lr in torni hell erliidc invern on the elinlte.

the irri :irnos or lever :irnie lll Ill', :d thnf tree ende: :ire 'Laivotzillv eonnerted with roninhvinenterr linlie l und lili tlmt ure :uierieiuiled l'roin the enelieneion urine; 19 lll', ln litrure il nl: the drawing the frohes 1S lil ure in nnrntion jlor lull stenni ahead, sind vullen lever l-lin pushed 'lorwzirfll to ite ex twine position. the position oi". the relies is wwe-ined, to provide 'lor revente movement ot the .Ute-uni preetsnre in the eviinders, while :nr intermediate Lioition ot the vol e will ililnee the nieehnnisen on center. Between tlir extreine-= the :veilt unir lie :nllju: nl lo eli re the :it nl' the :willw ating levert; ill livr :iltersngr the relntionein.i ol' the Fevs'rul pivot riointn of the Siler pen. lon linlisf :ind eoilulunu tion t the punition nl thx vulves und nlteri l their elrolwe.

ln the fnnirutnni of the vulve retiring it will lie :igniurent thnt the I'errigirornl, more nient ot the erom hendeol the meinen is" troneinitlrd to the :Huntingu levers. :1nd h v the hell ernnl; leverziee notion to the eonilii nation leverV und tlienrf lo the vulve rnd@ :ind velvet: in the #tenui elielitn.

The ndji zieeeinnl "tiruifnt ol the vulve gpeiirinr in troni lever ll through reanfli rods lll li liv menne nl n'liirh the divided nlntt ll l2 ie rot-lied en its; limirnijn.;q the eeetion All liningW turned in lieurinire in dirne tion onpoeite to tlmt ot the evelien l2. time adjusting the position nl the tire rohen ltl und 11S.

In Figure Q the ermee trend 4 ie :it the extreme forward endot itsetroke mid the beginning of its return stroke "while heed "Jf is in n mid position on its return Stroke or ninetfi7 degrees `in ndvnnee of the erneshesnl l. Lever Q3 and crunk arm 3l andfiuspension arm it) with pivot pinBB of etione ll lh 'and the combination lever 27 are also at midposition and driven by the cross head il. Valve 8 is just opening with the required lead to admit steam into the forward end of the cylinder, and likewise permitting eX haust out at the rear end of the cylinder. Valve 8 is open to its fullest extent and has started to close. As the cross heads advance in their strokes valve 8 is moved by the combined action of pivot pins 33 and 26 thus increasing the speed of the valve S and causing it to close quickly thereby cutting off the steam promptly and completely and allowing the piston to complete the remaining portion of its stroke under expansion of steam in the cylinder.

It will. be noted that while trunnions 2O of the suspension arm 19 are located above the pivot 33 of the short arm of the actuating lever 30, the trunnions 20 are depressed below the pivot 33 in order that these pins 33 33 shall reciprocate ninety degrees iii advance of the cross heads.

The pivot pins 26 26 also inove in advance of the pins 33 33 and therefore rock arms 25 25 carrying the pins 26 26 provide for the necessary angle of advance from lap to lead of the valves. rIhe movement of the pms 33 33 provide for the port opening of the valves, and the variation in elevation or depiession of the trunnions 2O 20 will increase the reciprocation or movement of the pins 33 33. As the trunnions 20 20 are brought nearer alinement with the pins 83 33', the reciprocal action of the pins is reduced and hence the greater will be the ratio of angle of advance of the pins 28 28', valves 8 and 8', and consequently an earlier out ofi1 of steam will be secured with greater expansion of steam.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent isl. In a valve gear, the combination with cross heads, valve rods,pcombination levers and links, of a transversely disposed hollow rock shaft having a crank arin, an actuating lever on said shaft having a link pivotally connected to one cross head, an inner rock shaft co-aXial with said hollow rock shaft and having a crank arm and an actuating lever and link pivotally connected to the other cross head, a pair of adjustable yokes, a pivoted suspension arm in each yoke and links pivotally supported from each suspension arm and pivot-ally connected with said crank arm, whereby part of the valve motion is obtained from one side of a locomotive and part from the other side.

2. In a valve gear the combination with a transversely disposed hollow rock shaft having a crank arm at one end and an inner rock shaft co-axial with said hollow rock shaft and having a crank arm at its opposite end, of a pair of spaced reversely atljustable yokes and a U-shaped suspension arm in each yoke, a link connecting each suspension arm with a crank arm, an actu ating lever on each shaft, a cross head and a link connecting the cross head to the actuating lever, a second link on each suspension arm and a combination lever connecting said link to an actuating lever, and a valve rod pivoted to each combination lever, whereby part of the valve motion is obtained from one side of a locomotive and part from the other side.

The combination with a transversely disposed, divided, tumbler shaft comprising oppositely adjustable sections, an operating lever and connections therefrom for turning said sections, supporting yokes, valve rods, a link and a combination lever pivotally connecting each said arm and rod, crank `arms and links connected to said arms, a

cross head, and means connected with said cross head for actuating said combination levers, whereby part of the valve motion is obtained from one side of a locomotive and part from the other side.

Ll. Thecombination with transversely disposed oppositely rotatable tumbler shaft sections having yokes thereon, said shafts and yokes together being adjustable as to position, pivoted arms in said yokes, and valve rods, of a pair of links suspended from 'each arm, a combination lever pivotally connecting one link of each said pair with a valve rod, an inner and an outer co-axial rock shaft each 4having an actuating lever operatively connected with said combination lever, a crank arm on each rock shaft, a link pivotally connecting the respective crank arms with the second link of said pair, a cross head, and means connected with the cross head for operating the actuating shafts, whereby part of the valve motion is obtained from one side of a locomotive'and part from the other side.

In testimony whereof I affix my signature.

SIDNEY J PERRY. 

